John Deere f1145 front mower's engine stops

t sounds like there may be an issue with the safety switches on your John Deere Z225 lawn mower. These safety switches are designed to prevent the engine from running if certain conditions are not met, such as if the parking brake is not engaged, the arms are not in the proper position, or the PTO is engaged.
Here are some things you can check:

1. Check the parking brake switch to ensure that it is properly engaged. If the switch is faulty, it may not be registering that the parking brake is engaged and will cause the engine to die when you disengage the parking brake.
2. Check the arm switches to make sure they are properly positioned. If the switches are faulty or out of position, they can cause the engine to die when you move the arms.
3. Check the PTO switch to ensure that it is properly engaged. If the switch is faulty, it may not be registering that the PTO is engaged and will cause the engine to die when you engage the PTO.
4. Check the wiring and connections for all the safety switches. Make sure they are not damaged or loose, as this can also cause the engine to die.

If you have checked all the safety switches and wiring and everything appears to be in working order, there may be a deeper electrical issue with the mower that will require further diagnosis

Is there a button to stop and start blades turning ? if so check that out its in the on postion it will not start .

Yes and what is the question?

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Most of these mowers have a safety switch between the PTO switch and clutch. A safety switch or relay is most likely the problem. Hope this will help ya.

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt?search=model&model=la105

Try replacing the starter solenoid. If that doesn't do it, try replacing the whole starter.

Park brake switch is the most likely culprit,any other would cause the tractor to not turn over in the crank position.

its likely to be a switch playing you up try hard wireing the switch to see if it stops this cutting out first, do one switch at a time till you fine the one playing up

Park brake switch ,pto switch and seat switch will all shut down the machine,pto and park will also keep it from starting,so start at the seat.